Rapidly expanding spin-polarized exciton halo in a two-dimensional halide perovskite at room temperature.

ABSTRACT: Monitoring of the spatially resolved exciton spin dynamics in two-dimensional semiconductors has revealed the formation of a spatial pattern and long-range transport of the spin-polarized excitons, which holds promise for exciton-based spin-optoelectronic applications. However, the spatial evolution has been restricted to cryogenic temperatures because of the short exciton spin relaxation times at room temperature. Here, we report that two-dimensional halide perovskites can overcome this limitation owing to their relatively long exciton spin relaxation times and substantial exciton-exciton interactions. We demonstrate the emergence of a halo-like spatial profile in spin-polarized exciton population and its ultrafast expansion at room temperature by performing time-resolved Faraday rotation

SUBMITTER: Yumoto G 

PROVIDER: S-EPMC9337763 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature